Complete the following achievements to unlock Xbox Live Gamerscore points.

Note: there are also 10 Secret Achievement with a total of 285 points.

Unlockables

Ammo Inventor (25 pts) Successfully invented all possible ammo types.
Avid Inventor (10 pts) Successfully invent at least 100 items.

Basic Inventor (5 pts) Successfully invent at least one item.
Bought One Slot (5 pts) Purchase one slot in any Plasmid or Tonic track.

Completed Welcome (10 pts) Successfully complete the Welcome To Rapture Level.

Dealt with every Little Sister (40 pts) Either Harvest or Rescue every Little Sister in the game.

Five Fully Upgraded Weapons (10 pts) Fully upgrade five weapons.
Four Fully Upgraded Weapons (10 pts) Fully upgrade four weapons.
Fully Researched Bouncer (10 pts) Fully research the Bouncer.
Fully Researched Gun Splicer (10 pts) Fully research the Leadhead Splicer.
Fully Researched Houdini Splicer (10 pts) Fully research the Houdini Splicer.
Fully Researched Little Sister (10 pts) Fully research the Little Sister.
Fully Researched Nitro Splicer (10 pts) Fully research the Nitro Splicer.
Fully Researched Rosie (10 pts) Fully research the Rosie.
Fully Researched Spider Splicer (10 pts) Fully research the Spider Splicer.
Fully Researched Thug Splicer (10 pts) Fully research the Thuggish Splicer.

Hacked a Safe (10 pts) Successfully hack a safe.
Hacked a Security Bot (10 pts) Successfully hack a security bot.
Hacked a Security Camera (10 pts) Successfully hack a security camera.
Hacked a Turret (10 pts) Successfully hack a turret.
Hacked a Vending Machine (10 pts) Successfully hack a vending machine.
Historian (50 pts) Find every audio diary.

Little Sister Savior (100 pts) Complete the game without harvesting any Little Sisters.
Lucky Winner (10 pts) Hit the jackpot at a slot machine.

Maxed All Tracks (50 pts) Purchased every slot in all four Plasmid and Tonic tracks.
Maxed One Track (20 pts) Purchased every slot in one of the Plasmid or Tonic tracks.

One Fully Upgraded Weapon (5 pts) Fully upgrade one weapon.
One Successful Hack (5 pts) Perform at least one successful hack.
Prolific Photographer (5 pts) Take at least one photo in every research group.

Quality Research Photo (5 pts) Take a Research Photo of the highest grade.

Research PhD (20 pts) Max out all possible research.
Researched a Splicer (5 pts) Take at least one Research Photo of a Splicer.

Seriously Good At This (40 pts) Complete the game on the hardest difficulty setting.
Skilled Hacker (40 pts) Successfully complete 50 hacks.

Three Fully Upgraded Weapons (10 pts) Fully upgrade three weapons.
Toaster in the Tub (10 pts) Shock an enemy in the water.
Tonic Collector (50 pts) Collect or Invent 53 Tonics in the Physical, Engineering and Combat tracks.
Two Fully Upgraded Weapons (5 pts) Fully upgrade two weapons.

Upgraded a Weapon (5 pts) Acquire at least one weapon upgrade.

Weapon Specialist (20 pts) Acquire all upgrades for all weapons.